How to tell if a guy likes you through Snapchat? Does he like me or is he just messing with me?

Anonymous
Sorry for the long message, but there’s a long backstory.

This guy used to like me, I think, but that was around 5 months ago. We haven’t really talked since, we never really talked though, and we got each other’s Snapchat a couple days ago through a friend (she is very good friends with the both of us, and I was there so we just shared Snapchats, it was very casual). Now that we have each other’s Snapchats, we just send normal snaps that we would send to others to each other, so like half of our faces. Yesterday night, he snapchatted “hey” at like 11 when we were just casually sending normal snaps back and forth, so I answered “hi”. He then just sent his hand waving and the rest was just normal snaps back and forth. What was that all about? This guy snapchats me and he normally answers like in 5-10 minutes, and so so do I. Sometimes he answers in 30 minutes which is completely normal. However, today I didn’t open his snap and instead snapped other people for like an hour, and then opened and answered his snap. After that, he opened my snap but hasn’t answered for almost 9 hours. What’s going on? And what are some signs he is flirting with me through Snapchat? How do I know he likes me (both on social media and in person)?
How to tell if a guy likes you through Snapchat? Does he like me or is he just messing with me?
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